基于激光的初级测温:综述

IF 4.4 2区 工程技术 Q2 CHEMISTRY, MULTIDISCIPLINARY
R. Gotti, Marco Lamperti, D. Gatti, M. Marangoni
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引用次数: 3

摘要

基于激光的初级测温是在大约15年前提出的,通过相关吸收跃迁的多普勒宽度来确定热力学平衡下气体的绝对温度,利用光学频率的潜在非常精确的测量来推断分子或原子吸收体难以捉摸的热能。这种方法,通常被称为多普勒增宽测温法,多年来受益于技术和基础性质的实质性改进,最终在最佳情况下达到约10ppm的温度测定精度。这足以使多普勒增宽测温在新开尔文的实际实现中发挥重要作用,新开尔文是继2019年从玻尔兹曼常数的固定值重新定义之后,并应对量化和可能修复1990年国际温标的系统不确定性等挑战。本文回顾并比较分析了迄今为止在基于激光的初级测温领域取得的方法和结果,还包括利用分子样品的粗纱带上的线强度和相关吸光度的温度相关分布的光谱方法。尽管处于开发的早期阶段,但这些方法在选择用于拟合吸收光谱的线形模型方面表现出了很好的稳健性,这对于所有基于激光的温度计来说都是一个微妙的方面。最后,我们确定了当前场景中可能的技术和科学进化轴。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Laser-Based Primary Thermometry: A Review
Laser-based primary thermometry was initiated almost 15 years ago by the proposal to determine the absolute temperature of a gas at thermodynamic equilibrium through the Doppler width of an associated absorption transition, exploiting the potentially very accurate measurement of an optical frequency to infer the elusive thermal energy of a molecular or atomic absorber. This approach, commonly referred to as Doppler broadening thermometry, has benefited across the years from substantial improvements, of both technical and fundamental nature, eventually reaching an accuracy of about 10 ppm on the temperature determination in the best cases. This is sufficient for Doppler broadening thermometry to play a significant role in the practical realization of the new kelvin, which follows the 2019’s redefinition from a fixed value of the Boltzmann constant, and to tackle the challenge, among others, to quantify and possibly fix systematic uncertainties of the international temperature scale of 1990. This paper reviews and comparatively analyzes methods and results achieved so far in the field of laser-based primary thermometry, also including spectroscopic approaches that leverage the temperature-dependent distribution of line intensities and related absorbances across the rovibrational band of a molecular sample. Although at an early stage of development, these approaches show a promising degree of robustness with respect to the choice of the line-shape model adopted for the fitting of the absorption spectra, which is a delicate aspect for all laser-based thermometers. We conclude by identifying possible technical and scientific evolution axes of the current scenario.
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来源期刊
CiteScore
6.90
自引率
11.60%
发文量
14
审稿时长
>12 weeks
期刊介绍: The Journal of Physical and Chemical Reference Data (JPCRD) is published by AIP Publishing for the U.S. Department of Commerce National Institute of Standards and Technology (NIST). The journal provides critically evaluated physical and chemical property data, fully documented as to the original sources and the criteria used for evaluation, preferably with uncertainty analysis. Critical reviews may also be included if they document a reference database, review the data situation in a field, review reference-quality measurement techniques, or review data evaluation methods.
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